BMI Calculator

Body Mass Index (BMI) is a standardized screening metric established by the World Health Organization (WHO) that compares an individual’s body mass relative to their height squared. The formula is expressed as:

• •Standard Formula: BMI = weight (kg) ÷ [height (m)]²
• •WHO International Cutoffs: Underweight (<18.5), Normal (18.5–24.9), Overweight (25.0–29.9), Class I Obesity (30.0–34.9), Class II (35.0–39.9), Class III (≥40.0).
• •Asian & South Asian Cutoffs: Due to higher risks of visceral adiposity, diabetes, and cardiovascular complications at lower BMI levels, WHO and Asian health authorities establish overweight at ≥23.0 and obesity at ≥27.5.

While clinical formulas provide valuable reference ranges, biological individuality plays a critical role in human physiology.

• •Does not distinguish between lean skeletal muscle mass, bone density, and adipose fat tissue.
• •Athletes, bodybuilders, and pregnant individuals will often yield misleadingly high BMI values.
• •Sarcopenic elderly individuals may have a "normal" BMI despite dangerous loss of skeletal muscle mass.
• •Should always be evaluated in conjunction with waist circumference and lipid panels.